Lysekloster was the largest agricultural property in the country when it was phased out during the Reformation in 1537. In its prime this cloister encompassed two-thirds of all the farms in Os. The monks introduced and cultivated new plant species and it was probably they who stocked the waters with fish not indigenous to the area. This legacy from the Middle Ages has left a lasting mark.
The area around Lysekloster is one of the most popular places in Hordaland for picking mushrooms. The large variety of mushrooms probably stems from the varied, old, cultural landscape which has a lot of open grazing areas and several types of fir- and deciduous forests.
I Kvassdalen var det aktiv stølsdrift med mjølking av kyr og geitehald nokre år inn i vårt tusenår, og slik hadde det vore i meir enn to hundre år. Såleis har dalen ikkje fått gro til med kratt og skog, men er open og lys. Fortsett er det beiting av kyr og sauer.